HYDRA
Service Manual
4-18
4-19. External Trigger Input Test
The External Trigger Input Test verifies that the rear panel trigger input of Hydra is
functioning properly.
1.
Switch OFF power to the instrument and disconnect all high voltage inputs.
2.
Remove the eight-terminal Alarm Output connector from the rear of Hydra and all
external connections to it. Connect short wires (to be used as test leads) to the
G
and
TR terminals. Leave other ends of wires unconnected at this time. Reinstall the
connector. Refer to Figure 4-4.
3.
Switch power ON.
4.
On Hydra, select the VDC function, 30V range for channels 0 through 5. Select a
scan interval of 30 seconds.
5.
Select trigger ON to enable the external trigger input. Press SHIFT, then
MON(TRIGS). (The display shows TRIG.) Then press either the up or down arrow
buttons until the display shows ON. Finally, press ENTER.
6.
Press the Hydra SCAN button. Hydra should scan channels 0 through 5 once every
30 seconds.
7.
During the interval when scanning is not occurring, connect (short) the test leads of
the TR and ground Alarm Output terminals.
Ensure the connection causes a single scan to occur.
8.
Disconnect (open) the TR and ground connection.
Ensure the scan continues to execute at its specified interval.
+
–
0
1 2 3 TR
0 1
2
3 4
5 6
7
Σ
9-16 V
DC PWR
!
+30V
ALARM OUTPUTS
DIGITAL I/O
+ –
0
1 2 3 TR
s29f.eps
Figure 4-4. External Trigger Test
4-20. Calibration
Hydra calibration is controlled with computer interface commands. The 2620A may be
calibrated by using the IEEE-488 or RS-232 interface, but the 2625A and 2635A may
only be calibrated via their RS-232 interface. Local (front panel) calibration is not
possible.
Summary of Contents for 2620A
Page 4: ......
Page 18: ...HYDRA Service Manual 1 2...
Page 48: ...HYDRA Service Manual 1 32...
Page 140: ...HYDRA Service Manual 3 16...
Page 234: ...HYDRA Service Manual 5A 34...
Page 236: ...HYDRA Service Manual 6 2...
Page 254: ...HYDRA Service Manual 6 20 2620A 1601 s63f eps Figure 6 3 2620A 2625A A1 Main PCA...
Page 258: ...HYDRA Service Manual 6 24 2635A 1601 s64f eps Figure 6 4 2635A A1 Main PCA...
Page 260: ...HYDRA Service Manual 6 26 2620A 4002 CKT 1 CKT 2 s65f eps Figure 6 5 A2 Display PCA...
Page 272: ...HYDRA Service Manual 6 38...
Page 274: ...HYDRA Service Manual 7 2...
Page 282: ...HYDRA Service Manual 7 10...
Page 284: ...HYDRA Service Manual 8 2...
Page 285: ...Schematic Diagrams 8 8 3 Figure 8 1 A1 Main PCA 2620A 2625A 2620A 1601 s88f eps...
Page 288: ...Schematic Diagrams 8 8 6 Figure 8 1 A1 Main PCA 2620A 2625A cont 2620A 1001 3 of 4 s73f eps...
Page 292: ...Schematic Diagrams 8 8 10 2635A 1001 2 of 5 Figure 8 2 A1 Main PCA 2635A cont s76f eps...
Page 293: ...Schematic Diagrams 8 8 11 2635A 1001 3 of 5 Figure 8 2 A1 Main PCA 2635A cont s77f eps...
Page 296: ...Schematic Diagrams 8 8 14 2620A 4002 CKT 1 CKT 2 Figure 8 3 A2 Display PCA s90f eps...
Page 300: ...Schematic Diagrams 8 8 18 2620A 1003 2 of 3 Figure 8 4 A3 A D Converter PCA cont s82c eps...
Page 301: ...Schematic Diagrams 8 8 19 2620A 1003 3 of 3 Figure 8 4 A3 A D Converter PCA cont s83c eps...
Page 302: ...Schematic Diagrams 8 8 20 2620A 1604 Figure 8 5 A4 Analog Input PCA s92f eps...
Page 304: ...Schematic Diagrams 8 8 22 2620A 1605 Figure 8 6 A5 IEEE 488 Interface PCA 2620A Only s93f eps...
Page 306: ...Schematic Diagrams 8 8 24 2625A 1606 Figure 8 7 A6 Memory PCA 2625A s94f eps...
Page 310: ...Schematic Diagrams 8 8 28...
