Model 1 1 153A Section V
SECTION V
MA1 NTENAN CE
5-1. I NTR 0 D UCTl 0 N. provided at the rear of this section for recording the
performance of the 11 153A. This card may be removed
This section contains information necessary to maintain the
from the manual and used as a permanent record of the
Model 11 153A. The following paragraphs describ% the
incoming inspection or of a routine performance check. If
Performance Checks, Adjustment Procedures, Servicing,
the 11153A is found to be out of specifications at any
and Troubleshooting. point in this procedure, refer to Paragraph 5-7, Adjustment
5-2. TEST EQUIPMENT REQUIRED. Procedures, or to the Troubleshooting information, Para-
graph 5-20.
Recommended test equipment for maintaining and check-
ing the performance of the Model 11 153A is listed in Table 5-4. AC VOLTAGE ACCURACY CHECKS.
5-1. Test instruments other than those listed may be used if
their specifications equal or exceed the required character- 5-5. Because of the wide voltage range and bandwidth of
the ac converter, several test setups are required to generate
istics.
the test signals needed to verify the accuracy specifications.
5-3. PERFORMANCE CHECKS. In many cases, the accuracy of the signal source alone is not
great enough to ensure a valid test of the 3484A ac
Use the following procedures to verify proper operation of
converter. In such cases, accuracy of the test signal can be
the Model 11153A True RMS Converter. The 3480A or
improved to an acceptable level by one of the two
3480B used, as well as the DCV function of the 3484A
following methods:
must be operating within specifications. The 3480AlB and
test equipment should be operated at a line voltage of a. AC to DC Transfer Measurement. Using a test setup
1 15 Vac (or 230 Vac) and ambient temperature of 2OoC to similar to that indicated in Figure 5-1, apply an
3OoC unless otherwise stated. It is recommended that the accurate dc voltage to the thermal converter, and
performance of the 11 153A be checked upon receipt and at adjust the dc differential voltmeter for a null indica-
90-day intervals thereafter. A Performance Check Card is tion. Remove the dc input from the thermal con-
DIGITAL VOLTMETER
hp 3480A/ 3484A
-
TEST SIGNAL
SOURCE
DC DIFFERENTIAL
DCSTANDARD
hp 7408
53~- e- 20431
Figure 5-1. AC Voltage Accuracy Checks.
5-1 |
ACEC
