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Model 5328A
Applications
"V" annunciators is displayed to indicate that a voltage measurement is being made. To return
control to the FUNCTION selector, the trigger level pushbutton must be released (by pressing).
When the FUNCTION selector switch is in DVM, external voltages applied to the Option 021's
floating input may be measured in a 10V, 100V, or 1000V range (or select AUTO ranging).
4-31. A filter switch allows a filter to be switched into the input path to allow the measurement
of very small dc levels in the presence of high common mode or normal mode noise.
4-32.
The trigger level read by the voltmeter in READ A or READ B modes must be multiplied by
the setting of the universal module's attenuator switch if using the standard universal module.
The level represents the center of the hysteresis band. If the counter has the Option 040 universal
module installed, the setting of the attenuator switch is automatically taken into account. If the
FUNCTION control is in T.1. A~B or T.1. AVG AB
(meaning that hysteresis compensation is in
effect), the trigger level read represents the top of the hysteresis band for -slope. In any other
functions, the trigger level represents the middle of the hysteresis band.
4-33.
The DVM
has three ranges, +10V (+12.5 overrange), +100V (+125V overrange), and
+1000V dc. Allowable measurement times and corresponding sensitivity is shown in the following
table.
RESOLUTION, N
Measurement Time
Sensitivity
1 kHz, 103
1Tms
100 mV
100 Hz 104
10 ms
10 mV
10 Hz 105
100 ms
1TmvV
1 Hz 106
1s
100 nV
1Hz 107
10s
10 pV
4-34.
The Option 021 DVM is floating, thus allowing differential measurements to be made.
Internal isolators and a floating power supply allow the floating measurements and permit DVM
measurement output over the HP-IB. (The HP-IB is described in Section V.) Maximum input from
HI to LO is 1100V dc. Maximum potential at LO with respect to chassis ground is +500V dc.
4-35.
With the rear panel ARM switch ON, a DVM measurement is initiated by an event at the B
input. This ability to "command"
aDVM measurement can be particularly useful when measuring
switched dc levels such as from dc supplies or D-to-A converters operating in computer operated
test systems. By adjusting channel B to trigger on the transition from one voltage to the next, the
DVM makes a measurement only during the time that the level is stable.
4-36.
Figure 4-7 illustrates an example of an armed DVM measurement. Select a measurement
time less than the width of the step to be measured and adjust the B trigger level to trigger on the
leading edge of the step.
Figure 4-7.
Armed DVM
Measurement
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