[Test-Equipment] Boonton 74 and 75 Capacitance bridges

[Pete Lancashire]

I'm trying to fill in the blanks on a couple models I can't find.

attached is the list of the variations I know of and the ones I've
seen reference to but don't know what the differences are

any help would be appreciated, and this winter will be posting it on a
new website along with scan of all the Boonton Electronics
manuals I have

-pete

in case the attachment doesn't make it

74 and 75
"generation 1"
74C
74C-S8

"generation 2"
74D 100 Kc 1mV to 4V. Internal bias supply. 0.1% accuracy

75A 1 Mhz 20 mV to 3V. 3-terminal (direct), or 2-terminal (grounded).
0.25% accuracy
75A-S4
75A-S6
75A-S8 75A with internal bias supply
75A-S13

75B 1 Mhz 1 mV to 3V. 3-terminal (direct) only
75B-S8 75B with internal bias supply

75C 5 Kc to 500 Kc 1 mV to 3V. Interal bias supply

75D 1 Mhz 1mV to 250 mV. 0 to 1000 pF. Internal bias supply. 2 and 3 terminal.

"generation 3"
75E unknown may be a missprint

Inductance

63H 5 Khz to 500 Khz. 0.0002 to 110 mH
63L 400 hz to 20 Khz. 0.02 to 11 H
63M 1 Khz to 100 Khz. 0.002 to 1.1 H

Other
74D, 75A, 75B, 75C in same catalog
63H, 63L and 63M in same catalog
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74 and 75
"generation 1"
74C
74C-S8

"generation 2"
74D	100 Kc 1mV to 4V. Internal bias supply. 0.1% accuracy

75A	1 Mhz 20 mV to 3V. 3-terminal (direct), or 2-terminal (grounded). 0.25% accuracy
75A-S4
75A-S6
75A-S8	75A with internal bias supply
75A-S13

75B	1 Mhz 1 mV to 3V. 3-terminal (direct) only
75B-S8	75B with internal bias supply

75C	5 Kc to 500 Kc 1 mV to 3V. Interal bias supply

75D	1 Mhz 1mV to 250 mV. 0 to 1000 pF. Internal bias supply. 2 and 3 terminal.

"generation 3"
75E	unknown may be a missprint

Inductance

63H	5 Khz to 500 Khz. 0.0002 to 110 mH
63L	400 hz to 20 Khz. 0.02 to 11 H
63M	1 Khz to 100 Khz. 0.002 to 1.1 H

Other
74D, 75A, 75B, 75C in same catalog
63H, 63L and 63M in same catalog