HYDRA
Service Manual
5-26
5-20. Calibration Failures
5-21. Introduction
Calibration of Hydra through the computer interface is described in Section 4 of this
manual. Generally, a calibration failure is indicated by a Device Dependent Error and a
"!>" prompt after a CAL_STEP? command if the RS-232 interface is being used. If the
IEEE-488 interface is being used, the Device Dependent Error may be detected by
reading the Event Status Register (see the Hydra User Manual). These indications occur
if the analog input varies from what the instrument expects to see by more than ±5% or
±15%, depending on the calibration step.
Before suspecting a fault with Hydra, verify that the calibration is being conducted
properly.
•
Check the connections between the source and the instrument. Are allthe
connections in place?
•
Check the output of the calibration source. Does it equal the valuecalled for by this
calibration step?
•
Check the calibration source. Is it in operate mode? Has it revertedto standby?
If a calibration step has failed, Hydra remains on that step so that the output from the
calibration source may be corrected or the calibration reference value (CAL_REF) being
used by Hydra may be changed if it was improperly entered. The calibration step may be
repeated by sending the CAL_STEP? command to Hydra again.
Calibration of Hydra utilizes a simple "calibration by function" approach. If you suspect
calibration errors, but the instrument does not exhibit the symptoms mentioned above,
verify that you are observing the following calibration rules:
•
Independent calibration of any function results in the storage ofcalibration constants
for that function only.
•
Once calibration is begun, all steps for that function must becompleted before the
calibration constants are stored. If all stepsare not completed and the procedure is
terminated, no constants forthat function are stored; only calibration constants for
previouslycompleted functions are stored.
5-22. Calibration-Related Components
If the calibration setup is correct, a faulty component within Hydra may be causing the
failure. Each measurement function depends on a combination of components in and
around the Analog Measurement Processor (A3U8).
RMS Converter
A3U6
AC Buffer
A3U7
Zener Reference
A3VR1
Divider Network (DC/Ohms)
A3Z4
Integrate Resistors, Reference Divider
A3Z2
AC Divider Network
A3Z3
RMS Converter Network
A3Z1
Basic dc measurements depend on the zener reference (A3VR1), reference divider
network (A3Z2), and integrate resistors (A3Z2). Resistance measurements and dc
measurements above three volts additionally depend on the resistors in the dc divider
network (A3Z4). AC measurements depend on the ac divider network (A3Z3), ac buffer
(A3U7), and RMS converter (A3U6), as well as the basic dc measurement components.
Содержание 2620A
Страница 4: ......
Страница 18: ...HYDRA Service Manual 1 2...
Страница 48: ...HYDRA Service Manual 1 32...
Страница 126: ...HYDRA Service Manual 3 2 3 30 Install the Handle and Mounting Brackets 3 15 3 31 Install the Instrument Case 3 15...
Страница 134: ...HYDRA Service Manual 3 10 Q Y U P J O A D B C V W G K L M E T X H I s25f eps Figure 3 5 2635A Assembly Details...
Страница 140: ...HYDRA Service Manual 3 16...
Страница 172: ...HYDRA Service Manual 5 2 5 28 Failure to Detect Memory PCA 5 29 5 29 Failure to Store Data 5 29...
Страница 234: ...HYDRA Service Manual 5A 34...
Страница 236: ...HYDRA Service Manual 6 2...
Страница 244: ...HYDRA Service Manual 6 10 A4 MP3 A4 H65 MP2 MP66 MP67 2620A 100 s58f eps Figure 6 1 2620A 2625A Final Assembly cont...
Страница 250: ...HYDRA Service Manual 6 16 A4 MP3 A4 H65 MP2 MP66 MP67 2620A 100 s62f eps Figure 6 2 2635A Final Assembly cont...
Страница 254: ...HYDRA Service Manual 6 20 2620A 1601 s63f eps Figure 6 3 2620A 2625A A1 Main PCA...
Страница 258: ...HYDRA Service Manual 6 24 2635A 1601 s64f eps Figure 6 4 2635A A1 Main PCA...
Страница 260: ...HYDRA Service Manual 6 26 2620A 4002 CKT 1 CKT 2 s65f eps Figure 6 5 A2 Display PCA...
Страница 265: ...List of Replaceable Parts Service Centers 6 6 31 2620A 1604 s67f eps Figure 6 7 A4 Analog Input PCA...
Страница 267: ...List of Replaceable Parts Service Centers 6 6 33 2620A 1605 s68f eps Figure 6 8 A5 IEEE 488 Interface PCA Option 05...
Страница 269: ...List of Replaceable Parts Service Centers 6 6 35 2625A 1606 s69f eps Figure 6 9 2625A A6 Memory PCA...
Страница 271: ...List of Replaceable Parts Service Centers 6 6 37 2635A 1606 s70f eps Figure 6 10 2635A A6 Memory Card I F PCA...
Страница 272: ...HYDRA Service Manual 6 38...
Страница 274: ...HYDRA Service Manual 7 2...
Страница 282: ...HYDRA Service Manual 7 10...
Страница 284: ...HYDRA Service Manual 8 2...
Страница 285: ...Schematic Diagrams 8 8 3 Figure 8 1 A1 Main PCA 2620A 2625A 2620A 1601 s88f eps...
Страница 288: ...Schematic Diagrams 8 8 6 Figure 8 1 A1 Main PCA 2620A 2625A cont 2620A 1001 3 of 4 s73f eps...
Страница 292: ...Schematic Diagrams 8 8 10 2635A 1001 2 of 5 Figure 8 2 A1 Main PCA 2635A cont s76f eps...
Страница 293: ...Schematic Diagrams 8 8 11 2635A 1001 3 of 5 Figure 8 2 A1 Main PCA 2635A cont s77f eps...
Страница 296: ...Schematic Diagrams 8 8 14 2620A 4002 CKT 1 CKT 2 Figure 8 3 A2 Display PCA s90f eps...
Страница 300: ...Schematic Diagrams 8 8 18 2620A 1003 2 of 3 Figure 8 4 A3 A D Converter PCA cont s82c eps...
Страница 301: ...Schematic Diagrams 8 8 19 2620A 1003 3 of 3 Figure 8 4 A3 A D Converter PCA cont s83c eps...
Страница 302: ...Schematic Diagrams 8 8 20 2620A 1604 Figure 8 5 A4 Analog Input PCA s92f eps...
Страница 304: ...Schematic Diagrams 8 8 22 2620A 1605 Figure 8 6 A5 IEEE 488 Interface PCA 2620A Only s93f eps...
Страница 306: ...Schematic Diagrams 8 8 24 2625A 1606 Figure 8 7 A6 Memory PCA 2625A s94f eps...
Страница 310: ...Schematic Diagrams 8 8 28...
