Table of Contents
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Operation and Reference
Amplitude
The [Amptd] (amplitude) key enables display, entry, or modification of the
mnplitude of the signal output. The indicator adjacent to the [Amptd] key
illuminates when an amplitude value is displayed. The displayed amplitude
value is changed with the numeric keypad and units keys, or modified with
the Modify keys. The Volt,
V RMS, mV RMS, and dBm units allow
convenient entry of amplitude values. Amplitude values are displayed in
Volts rms, Volts peak-to-peak (Vp;p), or dBm as denoted by the indicators at
the right of the display. The amplitude range is dependent upon selection of
dc offset and the high voltage option (see table 1-6). The output signal is
momentarily set at zero volts when internal attenuator settings change.
The HP 3325B units keys convert amplitude values to Vpp, Vrms. or dBm for any function.
For example, if a sine wave amplitude of 10 Vpp is displayed, pressing the [Vrmsl or [mVrmsl
key displays the same amplitude as 3.536 Vrma, while pressing the [dBm] key displays the
value as 23.98 dBm. When changing from one function to another, the last amplitude
displayed is held constant.
Ampfcj
Table 1-6. Amplitude Limits of AC Functions
Vpp
Vrms
dBm (son)
Function
Max.
Min.
Max.
Min.
Max.
Min.
Sine
Square
Triangle
±Ramp
10V
1
mV
10V
1
mV
10V
1 mV
10V
1
mV
3.536V
0.354 mV
5.000V
0.5 mV
2.887V
0.289 mV
eSSTV
0.289 mV
-i-23.98
-56.02
+26.99
-53.01
+22.22
-57.78
+22.22
-57.78
DC Offset
The [DC Offset] key enables display, entry, or modification of the dc offset of
^^ O
the signal output. The indicator adjacent to the [DC Offset] key illuminates
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^
displayed. The displayed dc offset value is changed
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with the numeric keypad and [Volt] or [mV] units key, or modified with the
modify controls. The dc offset range is dependent upon amplitude and the
high voltage option. Figure 1-2, and table 1-7 and 1-8 list the maximum
output of the HP 3325B. The output signal momentarily drops to zero volts
when internal attenuator settings change.
The DC Offset indicator in Main Function key block illuminates when a
non-zero dc offset value exists.
1-17
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