HP 437B Service Manual

HP 437B
Service Sheet BD1
EUETES EA A
Service Sheet
BD1 Overall
Trouble-
shooting
References
Troubleshooting Strategy ........... 2... e cece e eee eee Section 8 (Front)
Internal ViewS ........... cece eee eee e cece teen eens Pages 8-65 and 8-66
Replaceable Parts List ........... ccc cece cece cence cece re eaees Section 6
Post-Repair Adjustments. ........... ccc eee e cece eee ee ene eens Section 5
Principles of The HP 437B Power Meter is a programmable single-channel average
Operation
responding
power
meter
with
a
built
in
1
mW
50
MHz
power
reference.
For
purposes of explanation and troubleshooting the Power Meter is split into
three functional sections:
1. The Digital Section and display/keyboard.
2. The Analog Section.
3. The Power Supply.
The keyboard and display are not user repairable, but they can be replaced
separately.
The Digital Section executes all functions that are enabled by the user via
front panel keystrokes (local operation) or HP-IB commands (remote
operation). The overall power range and frequency response of the Power
Meter is determined by the power sensor that is connected to the front panel
input connector.
The power sensor converts the input power to an analog voltage. This
voltage is conditioned and digitized by the Analog Section. The Digital
Section calculates and displays the measurement result in the specified units.
Digital Section
The Digital Section provides control over all of the Power Meter’s functions.
The following text describes the function of each of the components of the
Digital Section.
SERVICE 8-15

HP 437B Specifications

General

Brand	HP
Model	437B
Category	Measuring Instruments
Language	English