Simpson 880 WATTMETER User Manual

SECTION II
UNPACKING AND INSTALLATION
2.1 UNPACKING
All Model 880 Instruments are packed one unit per carton.
An instruction manual is enclosed with each instrument. When
removing the instrument from the carton DO NOT CUT THE
BOX!! Doing so may damage the instrument. Also, if the in-
strument is found to be damaged in transit or must be returned
for any other reason, the original carton can be used.
2.2 INCOMING INSPECTION
Carefully check for any visible signs of damage that may have
occurred in transit such as a cracked glass window, chipped
or marred case or panel, etc. Check instrument movement for
freedom of action. There should not be any indication of bind-
ing or sticking of the pointer. Refer to the page of specifica-
tions in this manual for balance and calibration accuracy, etc.
See Section 3 for operating instructions.
2.3 PHYSICAL MOUNTING INSTRUCTIONS
The Model 880 Instruments may be used in the horizontal or
vertical position. The handle may be used to position the in-
strument at a convenient angle by folding the handle back
under the instrument case.
The guaranteed accuracy of Model 880 instruments applies only
when the unit is used in horizontal position, (front panel of
Instrument facing upward). Therefore when the most precise
measurements are required always place the instrument in a
horizontal position.
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SECTION III
OPERATING INSTRUCTIONS
3.1 SAFETY PRECAUTIONS
When connecting an instrument into a circuit, it is always a
sound safety policy to turn off all power and discharge all capa-
citors in the circuit under test. Then proceed to connect the
instrument into the. circuit. Pictorial diagrams are included
in this manual to serve as an aid in helping the technician fol-
low the correct test procedure in a variety of circuit applications.
Caution should be exercised to insure that the lead wire, clips,
and terminals are of sufficient gauge to carry the maximum
current to the instrument. Batteries or external power sources
are not required for the Model 880 Instruments.
3.2 LEADS AND BINDING POSTS
Leads are not supplied with the Model 880 instruments. A
spade type of terminal on the lead end that connects to the in-
strument binding post is very satisfactory. The binding post
diameter is 0.2". The lead insulation should have a dielectric
strength well in excess of the maximum voltage applied to the
instrument.
3.3 ZERO ADJUSTMENT
Each time the Model 880 is put into service the zero setting
should be checked. Place the instrument in the horizontal po-
sition. Check the movement pointer to see if it is exactly over
the zero mark on the scale. If the pointer is off zero, it should
be reset. This is accomplished by placing a screw-driver in the
slot of the zero adjust screw located in the movement cover.
The zero adjust screw can then be rotated a full 360 degrees
clockwise or counterclockwise to place the instrument pointer
exactly over the zero graduation. When a precise zero setting
has been made, slowly back off the zero adjust screw a very
slight amount so as to relieve pressure off the zero adjust screw
resting against the movement zero adjust fork.
3-1

Simpson 880 WATTMETER Specifications

General

Brand	Simpson
Model	880 WATTMETER
Category	Measuring Instruments
Language	English