Equipment information:

Hewlett Packard 414A Analog multimeter
Hewlett Packard
Model: 414A
Date: 1966
Category: Measurement instruments
Group: Analog multimeter
Description: Autovoltmeter
                                    The Model 414A Autovoltmeter is used to accurately measure
dc volts and ohms with immediate, automatic range selection.
Operation is simply "touch and read." Automatic, overload
protection circuits insure that the instrument will not be
damaged by an overrange voltage before upranging can occur.
Both range and polarity are displayed in illuminated
characters above the meter.

In the AUTO mode, a downrange to the next lowest range
occurs when the measured voltage or resistance falls below
25% of full scale; and an uprange to the next highest range
occurs when the measured voltage or resistance rises above
96% of full scale.

A HOLD mode provides manual downranging, a step at a time,
using the DOWNRANGE switch and also adds a noise filter to
the input. When measuring voltage in this mode, an automatic
uprange to the
1500 v range will occur if the measured voltage exceeds full
scale by 40%. On resistance measurements in the HOLD mode,
upranging will never occur, even when the measured
resistance becomes infinite, such as when the probes are
removed from a resistor.

These manuals are available for the above equipment:

Hewlett Packard -- 414A -- Service and User Manual
File name: HewlettPackard-4940-Manual-Page-1-Picture
Manual Type: Service and User Manual
Pages: 69
Size: 24.07 Mbytes (25238222 Bytes)
Language: english
Manual-ID/Number: 01789-1
Date: June 1966
Quality: Scanned document, all readable.
Upload date:
MD5: 9b55fee88708f7a5f2a6f246b9d2babd
ed2kID: 86a95bb26fbc7b7b9f34b889dc3899d6
Downloads: 86 since 30 November 2013

Appendix C, Manual Backdating Changes, adapts manual to
Serials Prefixed: 605- and 531-.
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