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Figure 1. Test points and adjustment locations - top view.
High Frequency Response

Calibration Procedure For True Rms Voltmeter, Models 89020 And 8921A Page Navigation
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TB 9-6625-2325-24
(11) Press and release FUNCTION AC+DC/AC pushbutton to AC.
(12) Set calibrator for voltages and frequencies listed in table 3.
If TI does not
indicate within limits specified, perform appropriate adjustments.
(13) Remove short connected between TP204 and TP209 (fig. 1).
Table 3. Low and Midband Accuracy (10 Hz to 100 kHz)
Calibrator output
Test instrument indications
Adjustments
Frequency
Voltage
Range
Min
Max
(R)
R2051
500 Hz
100
mV
200  mV
99.50
mV
100.50
mV
R441
500 Hz
1.9  mV
2  mV
1.8620 mV
1.9380 mV
50 kHz
100
mV
200  mV
99.50
mV
100.50
mV
C9
500 Hz
1
V
2V
.9950 V
1.0050 V
R3
500 Hz
100
V
200  V
99.50
V
100.50
V
R7
C52
50 kHz
1
V
2V
.9950 V
1.0050 V
C82
50 kHz
100 V
200  V
99.50
V
100.50
V
10 Hz
1.9  mV
2  mV
1.8050 mV
1.9950 mV
---
40 Hz
1.9  mV
2  mV
1.8430 mV
1.9570 mV
---
5 kHz
1.9  mV
2  mV
1.8620 mV
1.9380 mV
---
10 Hz
19
mV
20  mV
18.050  mV
19.950  mV
---
40 Hz
19
mV
20  mV
18.620  mV
19.380  mV
---
5 kHz
19
mV
20  mV
18.810  mV
19.190  mV
---
100 kHz
19
mV
20  mV
18.810  mV
19.190  mV
---
10 Hz
190
mV
200  mV
180.50
mV
199.50
mV
---
40 Hz
190
mV
200  mV
188.10
mV
191.95
mV
---
5 kHz
190
mV
200  mV
189.05
mV
190.95
mV
---
100 kHz
190
mV
200  mV
189.05
mV
190.95
mV
---
10 Hz
1.9  V
2V
1.8050 V
1.9950 V
---
40 Hz
1.9  V
2V
1.8810 V
1.9190 V
---
5 kHz
1.9  V
2V
1.8905 V
1.9095 V
---
100 kHz
1.9  V
2V
1.8905 V
1.9095 V
---
10 Hz
19
V
20  V
18.050  V
19.950  V
---
40 Hz
19
V
20  V
18.810  V
19.190  V
---
5 kHz
19
V
20  V
18.905  V
19.095  V
---
100 kHz
19
V
20  V
18.905  V
19.095  V
---
10 Hz
190
V
200  V
180.50
V
199.50
V
---
40 Hz
190
V
200  V
188.10
V
191.90
V
---
5 kHz
190
V
200  V
189.05
V
190.95
V
---
100 kHz
190
V
200  V
189.05
V
190.95
V
---
40 Hz
600
V
700  V
594.00
V
606.00
V
---
5 kHz
600
V
700  V
597.00
V
603.00
V
---
40 kHz
600
V
700  V
597.00
V
603.00
V
---
+DC3
1
V
2V
.9850 V
1.0150 V
---
+DC
1
mV
AUTO
.8800 mV
1.1200 mV
---
1Interaction exists between R44 and R205 (fig. 1). Repeat both adjustments as required.
2Interaction exists between C8 and C5 (fig. 1). Repeat both adjustments as required.
3Press FUNCTION AC+DC/AC pushbutton to AC+DC.
7


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