21
The Maser displays:
Time code in hours, minutes and seconds;
Error code, listed in Table 8.2;
Tunable synthesizer frequency code.
THE MASER CHI-76A ERRORS
Table 8.2.
№
Error type
0
No time scale
1
No AFC lock
2
No signal from the multiplier 5
–
100 MHz
3
20.4 MHz or digital synthesizer is fault
4
Oven temperature is above or below normal
5
No HF discharge
6
Purifier is fault
7
No hydrogen
8
Low vacuum in Hydrogen Discriminator vacuum system
9
No 5 MHz output signal from the crystal oscillator
The Maser also provides:
I) interface functions according to Table 8.3.
THE MASER CHI
–
76A INTERFACE FUNCTIONS
Table 8.3.
Function Designation
Function Name
Function Capabilities
SH1
Source Handshake
All
AH1
Accept Handshake
All
T6
Talker
Main Talker
L4
Listener
Main Listener
SR1
Service Request
All
DC1
Device Clear
All
DT1
Device Trigger
All
2) programmable operating modes according to Table 8.3.
PROGRAMMABLE OPERATING MODES
Table 8.4.
Operating Mode
First byte on data line
Second byte on data line
Symbol
Octal
code
6 5 4 3 2 1 0
6 5 4 3 2 1 0
1 0 0 0 0 0 0
A
101
Tunable synthesizer correcting
code reception
0 1 1 0 0 0 1
1
061
Data output in check mode
0 1 1 0 0 1 0
2
062
Tunable synthesizer diagnostic
information output
0 1 1 0 1 0 0
4
064
Summary of Contents for CH1-76A
Page 2: ...2 Fig 1 The CH1 76A Passive Hydrogen Maser ...
Page 8: ...8 Fig 5 1 The Maser CHI 76A Simplified Block Diagram ...
Page 9: ...9 Fig 5 2 The Maser CH1 76A Detail Block Diagram ...
Page 12: ...12 Fig 6 1 The Maser CH1 76A Package Design ...
Page 14: ...14 Fig 7 1 The Maser CH1 76A Front A and Rear B Panel ...
