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OPERATING AND SERVICE MANUAL
SPECIAL SUPPLEMENT
11683A OPTION H01
POWER METER RANGE CALIBRATOR
11683-90010
Model Number: 11683A Option H01
Part Number: 11683-90010
Date Printed: March 2007
2
Description ................................................................................................................................ 4
Specifications............................................................................................................................. 4
Operation .................................................................................................................................. 4
Performance Test ...................................................................................................................... 5
Caution...................................................................................................................................... 5
DVM Reading (OHM)................................................................................................................ 6
Replacement Parts .................................................................................................................... 6
3
Description
The 11683A Option H01 is a standard 11683A range calibrator that has been modified so
that it will operate with either the Internal DC-Reference source, or an external
programmable DC-Reference source.
Specifications
External DC Reference is the same as the Internal Reference.
Operation
The 11683A Option H01 Range Calibrator allows a user to select either an internal or an
external DC-Reference source. With the REF SELECT switch in the INT position, the range
calibrator is operating manually with the Internal DC-Reference source. With the REF
SELECT switch in the EXT position, the range calibrator can be programmed remotely with
a programmable DC source. In this mode of operation, the REF SELECT switch disconnects
the internal DC source, and connects the external DC source to the sampling gate assembly
(A3).
In all other respects, the 11683A Option H01 operates the same as the standard 11683A.
The typical input voltages corresponding to the different range settings are:
Range Volts
100 mW 15.800V
30 mW 4.7121V
10 mW 1.4641V
1 mW 145.00 mV
300 uW 45.837 mV
100 uW 14.494 mV
30 uW 4.5832 mV
10 uW 1.4501 mV
3 uW 458.69 uV
The above calculated voltages for range 100 mW to 300 uW are base on the table shown on
page 7 of the 11683A Operating and Service Manual. The remaining voltages are base in
the voltage divider circuit (A1), and the input resistance (A1R1, A3A1U1R1 and A3R1), of
the sampling gate assembly shown on page 21 of the 11683A Operating and Service
Manual.
All voltage calculations assume that the internal reference voltage has adjusted to 145.00
mVDC, with range switch set at 1mW position.
4
Performance Test
Internal DC Reference
With REF SELECT switch in INT position, range switch performance can be tested as
described in paragraphs 38-41 of the 11683A Operating and Service Manual. Power supply
and FET balance adjustments can also be performed as described in page 8(paragraphs 42-
51) of the Operating and Service Manual.
External CD Reference
Description:
Use the internal DC reference source to test the EXT. DC reference.
Equipment:
Recommended equipment for performing these tests are a digital voltmeter with 5 digits
resolution, a jumper (#18 awg or heavier wire), and a banana connector to the BNC 4-wire
cable.
Procedure
Set range as follows:
RANGE...............................................................................100 mW
FUNCTION..........................................................................STANDBY
POLARITY..........................................................................NORMAL
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