#Hewlett packard 34401a manual Manual Pdf#
(Note that Service Note 3438A-5A was included as a PDF when I purchased theģ438A's Operating and Service Manual PDF from "occasionally switch contacts become dirty and introduce numerous problems" with This problem had been recognized earlier by HP, and they acknowledged that Incorrectly displaying the measured function) was due to the front panel I suspected that much of the flaky operation (including LED annunciators So Q402 was operating within spec, and I decided Per the manual's parts list, the power dissipation specification of Q402 isĭescribed to be 1 Watt.
Measured Vce of 5.5 volts, the transistor was dissipating 0.6 watts. The voltage drop across this resistor wasġ.1 volts, thus Q402's collector current was 110 mA. To measure Q402's collector current I wired a 10 ohm resistor in series withĬR408 (see schematic, above). Voltages with both a DVM and with a scope. The first things I like to do before I dive into a repair job is to verify DC Over time, power supply electrolytic capacitors can become faulty. "mA" LED annunciators when the AC mA switch was depressed. The "kΩ" LED annunciator would illuminate in lieu of either the "uA" or the Ohms improperly reading "OL" on the 2000 Kohm and 20 Megohm scales for a Intermittent On/Off Pushbutton (sometimes it would turn on, and sometimes it When I got it home I discovered the following:
The price was inexpensive, and so I anticipated that it might have some (coincidentally the same year I graduated from college as a new
#Hewlett packard 34401a manual serial number#
The serial number on my meter had a "1717" prefix, making its vintage 1977 Of these five functions, three can be auto-ranged: DC Volts, Selectable functions: DC Volts, AC Volts, DC Amps, AC Amps, and The 3438A is a 3.5 digit HP-IB controllable multimeter. Multimeter I had picked up last year at a local electronics swap meet. This blog post is a record of my notes made while repairing an HP 3438A Digital
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