HP 5065A Operating And Service Manual page 39

Model 5065A
Circuit Diagrams, Theory, and Maintenance
Table 5-2. In-Cabinet Performance Check (Cont'd)
Check TIME DELAY by setting thumb­
wheel switch to following positions and
observing output pulse delay on Time
Interval Counter. Time interval change
should correspond with switch settings.
7 us
8
MS
70 ixs
80/us
700
MS
800
MS
7 ms
8 ms
70 ms
80 ms
700 ms
800 ms
999.999 ms
Adjust 0-1 MS TIME DELAY control.
Time interval counter should show delay
change of 1 MS.
FREQUENCY STABILITY OF 5 MHz OUTPUT
(Sigma y of Tau)
The rms deviation of the 5 MHz output is measured
using the HP Model 5390A Frequency Stability
Analyzer option 010, and the Model 105B option
H66. This equipment enables measurements of
Sigma y of Tau for averaging times as short as
50 ms.
In this procedure measurements will be made with
averaging times between 50 msec and 100 seconds.
Since the 100 second averaging time measurement
takes over 3 hours to complete, this portion of the
test may be deleted.
The information given below is designed to be used
in conjunction with the 5390A FSA option 010
"Sigma y of Tau" users manual. System connection
should be done per this manual. The following infor­
mation provides the necessary operating param­
eters to enable the operator to verify the 5065A
specification over the measurement range.
The test assumes that the reference standard is an
HP Model 5061A with option 004 or another 5065A.
To perform the tests, connect to 5390A FSA System
as shown in Figure 5-5. Input information to FSA
System as follows:
Step
1
2
3
4
5
Data
Requested
Program name
Max data array
size
Max numb, tau's
Year
Key function
tau
number of
samples
measurement
bandwidth
carrier frequency
correction
coefficient
Key function
Measurement
description
Input Data
ffddmtd (see Note 1)
100
10
Last 2 digits of year
ENTER MEAS
PARAMETERS (fo)
.05 CONTINUE
.1 CONTINUE
1 CONTINUE
10 CONTINUE
100 CONTINUE
0 CONTINUE
100
100,000
5e6
1.414
START MEASUREM
5065A s/n Performar
Note:
ffddmtd = fractional frequency difference
dual-mixer time difference method.
The 5390A will type heading, measurement param­
eter data, and then proceed with the measurement.
Measured values should be equal to or less than the
corresponding values given in the specifications,
Table 1-1.
Figure 5-5. 5 MHz Output Stability Test Setup
5061A or
5065A
{REFERENCE
OSCILLATOR)
105B
OPTION H66
5 MHz
^ 5 MHz
RF
FREQUEfS
A N A L Y Z E
10830A
MIXER/IF
AMPLIFIER
NO. 1
POWER
DIVIDER
5390*
C Y S
R (OP
TABIL
TIONG
TY
101
10830A
MIXER/IF
AMPLIFIER
NO. 2
J"
J
J
LO
RF
1
5 MHz
I
5065A
(TEST
OSCILLATOR)
5-5