OPTIONS 03,04,05
TIME BASE OSCILLATORS
Three Time Base Oscillators are available
as
options for either the model 545Aor 548A.These high stability
options enhance the accuracy of the counter by the addition of oven stabilized crystal oscillators. These
oscillators improve counter operation by reducing both time temperature variations.
When any one of these options
is
installed, the TCXO
is
removed from the Gate Generator board (A107)
and the following components are added.
One of three Oven Oscillators (A1 14) mounted on the chassis.
28 VDC Power Supply board (A1 12)
,
assembly part number 201 0226
Power Supply Transformer T1 (part number 4900006) mounted on A1 12.
Time Base Adjustment Pot J2 (part number 2010190) mounted on the rear panel.
Related interconnecting cable harnesses.
Figure
03/04/05-1. Time Base Oscillator Option Specifications
CHARACTERISTIC
AGING RATE124 HOURS
(After
72
hour warm-up)
SHORT TERM STABILITY
f
1
second average)
OPTION 03
203001 0
-
0 1
<)5~
IO-~I
<
1 x 10-'~rms
0' to
+
50'
c
TEMPERA-
TURE STABILITY
f
10%
LINE VOLTAGE
CHANGE
OPTION 04
20300 1 0
-
02
<~IxIo-~(
<
1 x 10 -10 rms
OPTION 05
203001 0
-
03
<I
5~ 10-101
<
1
x
10''~ rms
<16x 10-8)
<I
5~ 10-10)
<13x 10-81
<(ZX
10-101
<13x10-8)
<I
2~ 10-101
Scans by ArtekMedia © 2007
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