Keithley 515 Other
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Model:
515
Date:
1967
Category:
Group:
Description:
Megohm Bridge
Information
The model 515 Megohm Bridge is a Wheatstone Bridge for
measuring resistors from 10⁵ ohms to 10⁻¹⁵ ohms with
accuracies from 0.05% to 1.0%. It is complete, with an
electrometer null detector, shielded enclosure for the
unknown, and a bridge voltage supply.
A unique system of switches is provided to allow corrections
to be made for the slow changes in resistance of the
standard high megohm resistors. This enables all values of
resistance to be read with rated accuracy, directly from the
bridge dials.
Bridge voltages in one volt steps up to 10 volts are
available from the internal supply. With external supplies,
voltages as high as 1,000 volts can be used.
A connector is provided so that unknown resistors can be
measured outside the instrument as well as in the built-in
shielded enclosure.
Manual type:
Service and User Manual
Pages:
46
Size:
2.03 Mbytes (2130136 Bytes)
Language:
english
Revision:
Manual ID:
Date:
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2013 01 13
MD5:
356195009ba7e0413669651cc6c9fbbb
Downloads:
861
Manual type:
Service and User Manual
Pages:
46
Size:
2.04 Mbytes (2141300 Bytes)
Language:
english
Revision:
Manual ID:
Date:
1962 01 01
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
2018 08 23
MD5:
a8eb2a5fe2f3f6b9a7908a7608248c9c
Downloads:
642
Information
III-9
1. Null Detector
Sensitivity ... III-9
2. Null Detector Zero
Drift ... 111-10
3. Resolution of the
Readout ... 111-10
4. Accuracy of the Read-
out and Standard
Resistors ... . 111-10
5. Temperature and Voltage
Coefficients in the
Bridge Resistors ... III-I2
6. Leakage Resistance
Across the Unknown, . . 111-12
7. Errors Caused by Guard
to Ground Resistance, . Ill-12
Section Page
8. Time Constants - Slow
Response ... 111-13
9. Transients Caused by
Push-to-Read Switch. , 111-14
10. Verification of the
Accuracy ... 111-14
IV. CIRCUIT DESCRIPTION ... IV-1
A. Power Supply ... IV-1
B. Null Detector ... IV-1
C. Bridge Circuitry ... IV-3
D. Overvoltage Protection. . . IV-4
V. MAINTENANCE ... V-l
6. REPLACEABLE PARTS ... 6-1
6-1. Replaceable Parts List. . 6-1
6-2. How to Order Parts, . . .
6-1 model 515 Replaceable
Parts List ... 6-2
model 515 Schematic
Diagram 14522D ... 6-10