12227 Simpson, 12227 Datasheet - Page 11

• Manufacturer Part Number: 12227
• Description: Analog Multimeters 270-5RT VOM HI A
• Manufacturer: Simpson

Specifications of 12227

• Accuracy: +/- 1.75 %
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4.16
c.
d.
e.
f.
g.
h.
When using the 10A range, never disconnect a test lead from a jack or from the
circuit while the circuit is energized. Doing so may damage the test jacks or leads
and the arcing may be hazardous to the operator. Turn off circuit power and wait
for the meter reading to drop to zero.
The polarity reversing feature of the function switch does not operate on the 0-
10A range. If polarity is found to be incorrect, turn off circuit power, wait for the
meter indication to read zero and then interchange test lead connections to the
circuit.
a.
b.
c.
d.
NOTE: The function switch has no effect on polarity for the 10 AMPs range.
e.
f.
g.
The 10A range is not internally fused in the 270.
Set the range switch at one of the four
range positions marked 1 mA, 10 mA,
100 mA, or 500 mA.
Turn OFF power. Discharge any ca-
pacitors in circuit.
Open the grounded side of the circuit
in which the current is being mea-
sured. Connect the VOM in series with
the circuit. Connect the red test lead
to the positive side and the black test
lead to the negative side.
Turn the power on. Read the current
in milliamperes on the black DC scale.
For the 1mA range, use the 0-10 fig-
ures and divide by 10. For the 10mA
range, use the 0-10 figures directly. For
the 100mA range, use the 0-10 fig-
ures and multiply by 10. For the 500mA
range, use the 0-50 figures and multi-
ply by 10.
Turn the power off and disconnect the
test leads.
Restore circuit to original condition.
Direct Current Measurement 0-10A Range
Plug the black test lead into the -10A jack and the red test lead into the +10A
jack.
Set the range switch at 10 AMPS (dual position with 10mA).
Turn the power OFF. Discharge any capacitors in the circuit.
Open the ground side of the circuit in which the current is being measured.
Connect the VOM in series with the circuit. Connect the red test lead to the
positive side and the black test lead to the negative side.
Turn the power on. Read the current directly on the black DC scale. Use the
0-10 figures to read directly in amperes.
Turn the power off and disconnect the test leads.
Restore circuit to original condition.
22
Figure 4-7. Jacks and Switch
Positions for Measuring Direct
Current
COMMON
-10A.
+D.C.
READ MANUAL BEFORE USE
-D.C.
WARNING
50V.
500MA.
AMPS.
ALL TERMINALS 1KV. MAX
270
100MA.
10MA.
AMPS
1MA.
+50
250MV.
AMPS.
+10A.
2.
2.1
2.2
2.3
2.4
This section contains information and instructions for the installation and ship-
ping of the Simpson 270-5. Included are unpacking and inspection procedures,
warranty, shipping and power source requirements.
Examine the shipping carton for signs of damage. If damaged, notify the carrier
and supplier and do not attempt to use the Instrument.
If Instrument appears to be in good condition, read Operator’s Manual in its en-
tirety.
Become familiar with the Instrument as instructed in the manual, then check the
electrical performance as soon as possible. Check that all items are included
with the Instrument (Table 1-2).
After unpacking the Instrument, a 1.5V battery and a 9V battery may be found in
separate envelopes in the box with the Instrument and test leads. Two alligator
clips for the test leads are in a polyethylene bag. (See Section 5 for instructions
on how to open the battery compartment and install the batteries.)
The Simpson Electric Company warranty policy is printed on the inside front
cover of this manual. Read the warranty policy carefully before requesting any
warranty repairs. For all assistance, including help with the Instrument under
warranty, contact the nearest Authorized Service Center for instructions. If nec-
essary, contact the factory directly and give full details of any difficulty and in-
clude the Instrument model number, series number, and date of purchase. Ser-
vice data or shipping instructions will be mailed promptly. If an estimate of charges
for non-warranty or other service work is required, a maximum charge estimate
will be quoted. This charge will not be exceeded without prior approval.
Pack the Instrument carefully and ship it prepaid and insured.
There are two batteries in the ohmmeter circuits, a NEDA 13F D size cell that
furnishes 1.5 volts for the R x 1 and R x 100 ranges and a NEDA 1604 battery that
furnishes 9 volts for the R x 10,000 range.
INSTALLATION
Unpacking and Inspection
Warranty
Shipping
Power Source Requirements
11