HP 608E Operating And Service Manual page 98

Appendix II
CHANGE C
CHANGE 0
CHANGE E
CHANGE F
CHANGE G
CHANGE H
CHANGE I
II -2
Model608F
Parts List:
Add the following:
Right-angle connector, HP Stock No. 1250-0076; BNC connector J8,
HP Stock No. 1250-0118.
Change the HP Stock No. of cable assembly WI from 00608-60037 to
00608-605.
Parts List:
Change Q7 to HP stock No. 1850-0103, 2N2190. Under Q7 change HP Stock
No. 1205-0011 to read 1205-0012. (Change included in instruments 710-00500
and below. Recommended change for all older models. )
Delete under R237 description: "Factory selected part - typical value given."
Figure 7-5:
Delete asterisk ("') after R237 to denoting factory selection; typical value given.
Table 1-1 (instrument serials below 710-00550):
Change Auxiliary RF Output specification to read:
"Fixed level CW signal from RF Oscillator (min amplitude 180 mv rms into
50 ohms) provided at front panel BNC female connector for use with HP 870BA
Synchronizer or other external equipment (e. g. frequency counter)."
Paragraph 5-22, step b (instrument serials below 710-00550):
Change to read, "Power meter should indicate -1. 8 dBm minimum."
Table 1-1:
Change second sentence of External Pulse Modulation specification to read:
"Above 220 MHz, combined rise and decay time less than 2
~sec."
Paragraph 5-27 step h:
Change test limit for "Combined pulse rise and decay times" to r-ead:
"2
jJ
sec max. "
Figure 7- 5 and Parts List:
Change Resistor R237 typical value 10.5K, HP Stock No. 0698-4477 to 11K,
HP Stock No. 0757-0443. Retain the asterisk to indicate typical value given.
Parts List:
Change Meter, M 1, HP Stock No. from 1120-1505 to 1120-0396.
Figure 7~4 and Parts List:
Change Resistor R12 from 150K, HP Stock No. 0690-1541 to
lOOK,
HP Stock No. 0690-1041.
Change Tube V2 HP Stock No. 1932-0043.
Change schematic to show R12 connected from V2A pin 6 to V2A pin 8.
Table 1-1:
Change drift specification to read:
"Less than 50 parts in 10 6 per 10 min period after one hour warmup.
Less
than 10 min to restabilize after changing frequency.
Stability when used with 8708A Synchronizer:
5 x lO- B /min; 2 x 10-7/10 min; 2 x
lO-
ti
/day; 2 x 1O-7/oC (00 to 55°C);
2 x 10- 7 /10% line voltage change."
"
!