Check Rms Voltage Measurement Accuracy; Alternate Check Of Rms Voltage Measure- Ment Accuracy - Tektronix 213 DMM Instruction Manual

Cal ibration-213 Service
d. Set the Standard output to +1.000 V.
e. CHECK-Reading of +1.000 ± 0.025 (0.975 to 1.025).
f. Disconnect the Standard.
12. CHECK RMS VOLTAGE MEASUREMENT ACCURACY
NOTE
The AC Calibration Standard is required to
verify the specified accuracy of each rms
voltage range with this procedure (step 12).
See footnote 3 in Table 6-1. If an AC Cali-
bration Standard is not available, the follow-
ing procedures are provided as alternatives to
the procedure following this note.
(a) If all previous calibration steps have been
accomplished, each circuit function involved
in rms voltage measurement has been checked
and adjusted; therefore, further rms voltage
measurement accuracy checks may not be
necessary for the instruments intended use.
(b) The procedure and equipment used in
Calibration step 10 can also be used to verify
the 0. 1, 1, 10, and 100 V rms ranges. The
1000 V range can be checked, but the output
of the Sinewave Generator is not sufficient
to provide the minimum 10% of full scale
input to verify the performance specification.
(c) Calibration step 12A is an alternate
method of verifying the 0. 1, 1, 10, and 100 V
rms ranges_ The 1000 V range also can be
checked with this alternate procedure, but
the rms value of the 100 V fixed output of
the Amplitude Calibrator is not sufficient
(at least 10% of full scale) to verify the per-
formance specification.
a. Set INPUT COUPLING to AC.
b. Connect the probe to the AC Calibration Standard
(Voltage configuration) with a dual banana-plug to BNC
adapter and a probe adapter.
c. Set VOL TS-mA/DIV and the Standard as show in
Table 6-9.
6-16
d. CHECK-Reading is within limits shown in Table 6-9.
e. Disconnect the Standard.
TABLE 6-9
RMS Voltage Measurement Accuracy
VOLTS- AC Calibration
mA/DIV
Standard
Limits
Setting Setting
(blue
(set at 4 kHz
4 kHz 40 kHz
scale)
and 40 kHz)
Reading
0.1 0.0100 .0100 .0093 to .0107
.0091 to .0109
0.2000
.2000 .1965 to .2035 .1925 to .2075
1
0.100 0.100 0.094 to 0.106 0.094 to 0.106
2.000 2.000 1.975 to 2.025 1.975 to 2.025
10 1.000 01.00 00.94 to 01.06 00.94 to 01.06
20.00 20.00 19. 75 to 20.25 19. 75 to 20.25
100 10.00 010.0 009.4 to 010.6 009.4 to 010.6
200.0
200.0 197.5 to 202.5
197 .5 to 202.5
1000
100.0 0100
0094 to 0106 0093 to 0107
500.0
0500 0490 to 0510
0485 to 0515
12A. ALTERNATE CHECK OF RMS VOLTAGE MEASURE-
MENT ACCURACY
NOTE
This procedure assures the specified accuracy
of the 213, but does not check all ranges (see
Note in Calibration step 12).
a. Connect the Digital Voltmeter and the probe to the
Amplitude Calibrator with a T-Connector, dual banana-
plug to BNC adapter, probe adapter, and a cable. Set the
Calibrator for a square wave output.
b. Set INPUT COUPLING to AC.
c. Set VOL TS-mA/DIV and Calibrator as shown in Table
6-10.
d. CHECK-Reading is within limits shown in Table 6-10.
e. Disconnect the Voltmeter and Calibrator.
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