4-2.
FREQUENCY RANGE AND CW MODE ACCURACY
Specification
Table 4-4.
Frequency Range and CW Mode Accuracy Specifications
Description
The HP 8340B/41B RF output is supplied to a frequency counter. The frequency counter internal time
base is used as the reference for the DUT to eliminate time base error from the measurement. The
DUT frequency display and the counter display should agree, within the resolution of each instrument.
This procedure does not test for CW mode accuracy as a function of the time base accuracy.
NOTE
A fault in the DUT could cause the two displays to be different. Any fault
that would cause one of the phase lock loops to be unlocked would be
indicated by a front-panel UNLK indication; however, all HP 8340B/41B
internal phase lock loops could be locked and the DUT output frequency
could be in error (i.e., a phase lock loop frequency divider bit could be
bad). If all the dividers work normally, then CW mode frequency
accuracy is essentially guaranteed.
In the following procedure, the test frequencies are selected first to test the maximum frequency
range and then to exercise each frequency related circuit throughout its CW range while holding all
remaining circuits constant. The test frequencies are grouped so that an abnormal indication would
point to the circuit most likely causing the problem.
Equipment
Frequency Counter
HP 5343A Option 011
Adapters
SMA
(in)
to BNC (f)
HP P/N 1250i 200
APC 3.5 (f) to APC 3.5 (f)
HP P/N S061-S3ii
(2 required if OUT is HP 8340B)
(1 required
if DUT is HP 8341 B)
Type N
(in)
to APC 3.5
(f)
HP P/N 1250-1 744
(1 required if DUT is HP 8341 B)
Cable (Semi-Rigid SMA male to SMA male)
HP P/N
08340-20124
Range:
HP 8340B: 0.01 to 26.50 GHz
HP 8341B: 0.01 to 20.00 GHz
Resolution: n x 1 Hz
Where N
=
harmonic multiplication number. Refer to Frequency Ranges and Bandswitch Points
description in the specifications portion of Section I.
Accuracy: Same as Time Base Accuracy in the specifications portion of Section I.
HP 8340B/41B
Performance Tests
4-13
