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HP 33120A Operation & User’s Manual

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HP 33120A User Manual
HP 33120A User Guide
HP 33120A Online Manual

Text of HP 33120A User Guide:

  • 7 Set the modulation depth to 80%. Notice that the AM annunciator flashes, indicating that the displayed percentage is the AM depth (also called percent modulation). 080 % DEPTH This message appears on the display for approximately 10 seconds. Repeat this step as needed. At this point, the function generator outputs the AM waveform with the specified modulatio

  • HP 33120A, Menu Example 2 The following example shows how to use the recall menu feature as a shortcut to set the POWER ON command back to its original setting. You must perform the steps in Example 1 before you start this example. 1 Use recall menu to return to the POWER ON command. This returns you to the POWER ON command, which was the last command used before you exited the menu in the Example 1. 2: POWER ON 2 Move down to the “ PARAMETER” choices. The first parameter choice is “ LAST STATE” (the cu

  • HP 33120A, Modulating Waveform Shape The function generator will accept an internal modulating signal, an external modulating signal, or both. • Modulating waveform shape (internal source): Sine, Square, Triangle, Ramp, Noise, or Arbitrary waveform. The default is Sine. • You can use the noise function as the modulating waveform. However, you cannot use the noise function or dc volts as the carrier waveform. • Front-Panel Operation: After enabling AM, press Recall Menu to go directly to the AM SHAPE command in the menu.

  • HP 33120A, Modulating Waveform Frequency The function generator will accept an internal modulating signal, an external modulating signal, or both. • Modulating frequency (internal source): 10 mHz to 20 kHz. The default is 100 Hz. • The sync signal for AM is referenced to the modulating signal (not the carrier). A momentary TTL “high” pulse (> 200 ns) is output at each zero-crossing point of the modulating signal. The signal is output from the front-panel SYNC terminal. • Front-Panel Operation: Press Shift Freq to set the modulating frequency (the value is displayed fo

  • HP 33120A, Output Termination Applies only to output amplitude and offset voltage. The function generator has a fixed output impedance of 50 ohms on the OUTPUT terminal. You can specify whether you are terminating the output into a 50 ohm load or an open circuit. Incorrect impedance matching between the function generator and your load will result in an amplitude or offset which does not match the specified signal level. • Output termination: 50Ω or High impedance. The default is 50Ω. See the table on page 59 for a list of amplitude limits for all functions. • The output termination setting is stored in volatile memory; 50 Ω is selected when power has been off or after a

  • HP 33120A, Arbitrary Waveforms There are five built-in arbitrary waveforms stored in non-volatile memory. You can also download up to four user-defined waveforms into non-volatile memory. Each waveform can contain between 8 and 16,000 data points. Refer to chapter 7, “Tutorial”, for more information on the internal operation of downloading and outputting an arbitrary waveform. Creating and Storing an Arbitrary Waveform This section gives an example which shows you how to create and store an arbitrary waveform from the front panel. To download an arbitrary waveform from the remote interface, see “Arbitrary Waveform Commands” starting on page 174. For this example, you w

  • HP 33120A, Self-Test • A power-on self-test occurs automatically when you turn on the function generator. This limited test assures you that the function generator is operational. • A complete self-test runs a series of tests and takes approximately 10 seconds to execute. If all tests pass, you can have a high confidence that the function generator is fully operational. • If the complete self-test is successful, “ PASS” is displayed on the front panel. If the self-test fails, “ FAIL” is displayed and the ERROR annunciator turns on. See the Servi

  • HP 33120A, Triggering Applies only to bursts and frequency sweep. You can issue triggers for bursts and sweeps using internal triggering, single triggering, or external triggering. • Internal or “automatic” triggering is enabled when you turn on the function generator. In this mode, the function generator outputs continuously when the burst mode or sweep mode is selected. • Single triggering outputs one burst or initiates one sweep each time you press Single from the front-panel. Continue pressing this key to re-trigger the function gener

  • HP 33120A, To Unsecure for Calibration You can unsecure the function generator for calibration either from the front panel or over the remote interface. The function generator is secured when shipped from the factory and the security code is set to “HP033120”. • Front-Panel Operation: 1: SECURED (CAL MENU) If the function generator is secured, you will see the above command when you go into the CAL MENU. (If you move across the “COMMANDS” level in the menu, you will notice that the “ CALIBRATE” command is hidden when

  • HP 33120A, Output Configuration This section contains information to help you configure the function generator for outputting waveforms. You may never have to change some of the parameters discussed here, but they are provided to give you the flexibility you might need. Output Function The function generator can output five standard waveforms including sine, square, triangle, ramp, and noise. You can also select one of five predefined arbitrary waveforms or download your own custom waveforms. You can internally modulate any of the standard waveforms (including arbitra

  • FSK Rate The FSK rate is the rate at which the output frequency “shifts” between the carrier frequency and the hop frequency when you select the internal FSK source. • FSK rate (internal source): 10 mHz to 50 kHz. The default is 10 Hz. • The FSK rate is ignored when the external source is selected. • Front-Panel Operation: 9: FSK RATE (MOD MENU) • Remote Interface Operati

  • A front-panel menu tutorial This section is a step-by-step tutorial which shows you how to use the front-panel menu. We recommend that you spend a few minutes with this tutorial to get comfortable with the structure and operation of the menu. The menu is organized in a top-down tree structure with three levels (menus, commands, and parameters). You move down ∨ or up ∧ the menu tree

  • HP 33120A, FSK Carrier Frequency • Carrier frequency: 10 mHz to 15 MHz (100 kHz for triangle and ramp). The default is 1 kHz. You can use sine, square, ramp, triangle, or arbitrary waveforms for the carrier waveform. • For arbitrary waveforms, the maximum carrier frequency depends on the number of points specified in the waveform. The five built-in arbitrary waveforms can be output at a maximum of 5 MHz. • For an externally-controlled FSK waveform, the carrier frequency is output when a “low” TTL level is applied to the FSK terminal. The hop frequency is output when a “high” TTL level is applied. • For FSK, the sync signal is refer

  • HP 33120A, To output a burst waveform You can configure the function generator to output a waveform with a specified number of cycles, called a burst. You can output the burst at a rate determined by the internal rate generator or the signal level on the rear-panel Ext Trig terminal. For this example, you will output a three-cycle sine wave. You will not change the other parameters from their default settings: internal burst source, 0 degree starting phase, and 100 Hz burst rate. 1 Select the function, frequency, and amplitude for the burst. For bursts, you

  • HP 33120A, DC Offset Voltage At power-on, the dc offset is set to 0 volts. You can set the offset to a positive or negative number with the restrictions shown below. If the specified offset voltage is not valid, the function generator will automatically adjust it to the maximum dc voltage allowed with the present amplitude. (Vmax is either 10 volts for a high impedance termination or 5 volts for a 50 ohm termination; Vpp is the output amplitude in volts peak-to-peak.) From the front panel, “ MAX VALUE” is displayed and the offset is adjusted. From the remote interface, a -221, “Settings conflict” error is generated and the offset

  • HP 33120A, Output Frequency As shown below, the output frequency range depends on the function currently selected. The default frequency is 1 kHz for all functions. For arbitrary waveforms that you create and download to memory, the maximum frequency depends on the number of points specified in the waveform. As shown below, the maximum output frequency decreases as you specify more points in the waveform. The five built-in arbitrary waveforms can be output at a maximum of 5 MHz. Function Sine Square Triangle Ramp Built-In Arbs 1 Minimum Frequ

  • HP 33120A, Menu Example 3 Some commands in the menu require that you enter a numeric parameter value. The following steps show you how to enter a number in the menu. For this example, you will set the number of cycles for the burst modulation mode. 1 Turn on the menu. You enter the menu on the “ MENUS” level. The MOD MENU is your first choice on this level. A: MOD MENU 2 Move down to the “ COMMANDS” level within the MOD MENU. The AM SHAPE command is your first choice on this level. 1: AM SHAPE 3 Mo

  • WAVEFORMS Standard Waveforms: Arbitrary Waveforms: Waveform Length: Amplitude Resolution: Sample Rate: Non-Volatile Memory: Sine, Square, Triangle, Ramp, Noise, DC volts, Sine(x)/x, Negative Ramp, Exponential Rise, Exponential Fall, Cardiac 8 to 16,000 points 12 bits (including sign) 40 MSa / sec Four (4) 16k waveforms FREQUENCY CHARACTERISTICS Sine: Square: Triangle: Ramp: Noise (Gaussian

  • HP 33120A, Amplitude Modulation (AM) A modulated waveform consists of a carrier waveform and a modulating waveform. In AM, the amplitude of the carrier is varied by the amplitude of the modulating waveform. The function generator will accept an internal modulating signal, an external modulating signal, or both. For more information on the fundamentals of Amplitude Modulation, refer to chapter 7, “Tutorial”. To Select AM Modulation • The AM annunciator turns on when AM is enabled. • Only one modulation mode can be enabled at a time. When you enable AM, the previous modulation mode is turned off. • Front-Panel Operation: Enable AM before setting up the other modulation parameter

  • To set the output amplitude At power-on, the function generator outputs a sine wave with an amplitude of 100 mV peak-to-peak (into a 50Ω termination). The following steps show you how to change the amplitude to 50 mVrms. 1 Enable the amplitude modify mode. The displayed amplitude is either the power-on value or the previous amplitude selected. When you change functions, the same amplitu

  • HP 33120A, System-Related Operations This section gives information on topics such as power-down recall, self-test, error conditions, and front-panel display control. This information is not directly related to waveform generation but is an important part of operating the function generator. Power-Down Recall Mode When power is turned off, the function generator automatically stores its state in memory location “0”. You can configure the function generator to automatically recall the power-down state when power is restored. The recall mode is disabled when the function generator is shipped from the factory. The power-down recall mode can be set from the front-panel on

  • Burst Phase The burst phase defines the starting phase of the burst. • Burst phase: -360 degrees to +360 degrees, in 0.001 degree increments. The default is 0 degrees. • For sine, square, triangle, and ramp waveforms, 0 degrees is the point at which the waveform crosses zero volts (or the dc offset value), in a positive-going direction. • For arbitrary waveforms,

  • HP 33120A, To output an FSK waveform You can configure the function generator to “shift” its output frequency between two preset values using FSK (frequency-shift keying) modulation. The rate at which the output shifts between the two frequencies (called the “carrier frequency” and the “hop frequency”) is determined by the internal rate generator or the signal level on the rear-panel FSK terminal. For this example, you will set the “carrier” frequency to 3 kHz and the “hop” frequency to 500 Hz, with an FSK rate of 100 Hz. 1 Select the function, frequency, and amplitude of the carrier. For the

  • HP 33120A, 1: OUT TERM 2: POWER ON 3: ERROR 4: TEST 5: COMMA 6: REVISION Selects the output termination (50 Ω or high impedance). Enables or disables automatic recall of the power-down state. Retrieves errors from the error queue (up to 20 errors). Performs a complete self-test. Enables or disables a comma separator between digits on the display. Displays the function generator’s firmware revision codes. 1: HPIB ADDR 2: INTERFACE 3: BAUD RATE 4: PARITY 5: LANGUAGE Sets the HP-IB bus address (0 to 30). Selects the HP-IB or RS-232 i

  • HP 33120A, To trigger a burst or sweep You can issue triggers from the front-panel for burst modulation and frequency sweeps using single trigger or internal trigger. • Internal or “automatic” triggering is enabled when you turn on the function generator. In this mode, the function generator outputs continuously when burst modulation or sweep is selected. • Single triggering outputs one burst or initiates one frequency sweep each time you press Single . Continue pressing this key to re-trigger the

  • HP 33120A, Ext Trig / FSK / Burst Input Terminal This terminal is used in the following modes: • Triggered Sweep Mode: Press Single or execute TRIG:SOUR EXT from the remote interface to enable the triggered sweep mode (sweeps must be enabled). When the rising edge of a TTL pulse is received on the Ext Trig terminal, the function generator outputs a single sweep. The Trig annunciator turns on when the function generator is waiting for a trigger. • Externally-Modulated FSK Mode: To enable the externa

  • HP 33120A, Remote Interface Configuration This section gives information on configuring the remote interface. For information on programming the function generator over the remote interface, see chapter 4, “Remote Interface Reference,” starting on page 125. HP-IB Address Each device on the HP-IB (IEEE-488) interface must have a unique address. You can set the function generator’s address to any value between 0 and 30. The current address is displayed momentarily on the front panel when you turn on the function generator. The address

  • HP 33120A, To output a stored arbitrary waveform There are five built-in arbitrary waveforms stored in non-volatile memory for your use. You can output these waveforms directly from non-volatile memory. The following steps show you how to output an “exponential rise” waveform from memory. 1 Display the list of arbitrary waveforms. The list contains the five built-in arbitrary waveforms (sinc, negative ramp, exponential rise, exponential fall, and cardiac). The list may also contain up to four user-defined

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