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PERFORMANCE VERIFICATION
5.8 AC FREQUENCY
RESPONSE
Use the following
procedure to determine whether or not
input
amplifier
frequency
response
adjustment
is
necessary. If the instrument
fails the test procedure,
the
AC frequency
response of the 32V and 200V ranges can
be adjusted, as described in paragraph 7.5.
The test points for the procedure below are summarized
in Table 5-3.
NOTE
The limits given are NCvr based on any inshu:ne"t
specification,
but
assume
a nominal
+2%
tolerance.
Table 5-3. AC Frequency
Response
Verification
Applied
Voltage*
Allowable
Reading-
32.ooov
31.360 to 32.64OV
100.00 v
98
to 102
v
*RMS values shown, 45kHz frequency.
**Limits
based on nominal
52% tolerance and not on
stated specifications.
1. Connect the AC calibrator (Table 5-l) to the VOLTAGE
INPUT jack of the channel being tested. Use the basic
connecting
scheme shown in Figure 5-3.
2. Using the CHANNEL
button, select the channel being
tested.
3. Set the Model 194 for the following
operating
modes:
A. Rate: 10~s~
8. Samples: 1000
C. Coupling:
AC
D. Trigger: Continuous,
input signal, O$J level.
E. Math Function:
TRMS
F. Filter: off
G. Zero: off
4. Set the AC calibrator output to 32.OOV at a frequency
of 45kHz.
5. Place the Model
194 on the 32V range and press
TRIGGER.
6. Verify that the displayed reading is between 31.360 and
32.64OV.
7. Place the instrument
on the 200V range and set the
calibrator output
to lOO.OOV at 45kHr.
8. Verify that the displayed reading is between 98.000 and
102.dOV.
CAUTION: MAXlM"M INPUT 250" PEAK
I. . . . ,.
Figure 5-3. AC Verification
Connections
5-6
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