HP 6633B - Manual (Page 53)

53
B
Verification and Calibration
Introduction
This appendix includes verification and calibration procedures for the HP 66332A and HP
6631B/6632B/6633B/6634B dc source. Instructions are given for performing the procedures either
from the front panel or from a controller over the HP-IB.
The verification procedures do not check all the operating parameters, but verify that the dc source
is performing properly. Performance Tests, which check all the specifications of the dc source, are
given in the applicable dc source Service Manual.
Important Perform the verification procedures before calibrating your dc source. If the dc
source passes the verification procedures, the unit is operating within its
calibration limits and does not need to be recalibrated.
Equipment Required
The equipment listed in the following table, or the equivalent to this equipment, is required for
verification and calibration.
Table B-1. Equipment Required
Equipment Characteristics Recommended Model
Digital Voltmeter Resolution: 10 nV @ 1 V
Readout: 8.5 digits
Accuracy: >20 ppm HP 3458A
Current Monitor 1
15 A (0.1
Ω
),
±
0.04%, TC=5ppm/
°
C Guildline 9230/15
Load Resistor
(3 W min. TC=20ppm/
°
C)
400
Ω
(HP 6631B calibration, used for
verification of all models)
1.1 k
Ω
(HP 6632B/66332A calibration)
2.5 k
Ω
(HP 6633B calibration)
5 k
Ω
(HP 6634B calibration)
HP p/n 0811-2878
Power Supply 8 V @ 10 A HP 6631B
HP-IB Controller Full HP-IB capabilities HP Series 200/300 or
equivalent
1 The 4- terminal current shunt is used to eliminate output current measurement error caused by voltage
drops in the load leads and connections. It has special current-monitoring terminals inside the load
connection terminals. Connect the voltmeter directly to these current-monitoring terminals.
Test Setup
Figure B-1 shows the setup for the tests. Be certain to use load leads of sufficient wire gauge to
carry the full output current (see chapter 3).