The Criterion
Instruments Limited Model DOT-5 Digital
Ohmmeter is a 4-Terminal Resistance Measuring
unit, primarily intended for the accurate
measurement of very low resistances.
Basically, it consists of a switchable
constant-current power supply and a Digital
Ohmmeter. The Model DOT-5 Digital Ohmmeter
comes complete and ready for use. It is
guaranteed against defective workmanship and
material for twelve months from date of
shipment.
|
| MODEL DOT-5 |
| RANGES: |
FULL
SCALE
|
RESOLUTION
|
TEST
CURRENT
|
1 m 
|
1 µ
|
10 A
|
10 m
|
10 µ
|
1 A
|
100 m
|
100 µ
|
1 A
|
1
|
1 m
|
100 mA
|
10
|
10 m
|
100 mA
|
100
|
100 m
|
10 mA
|
The accuracy
is better than ±0.3% of full scale
SIZE: 13W x 8H x 8D (in.)
|
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MODEL DOT-20
|
SPECIFICATIONS |
INPUT VOLTAGE
|
120 V, 60 Hz (approx. 5 A) |
OUTPUT TEST
CURRENT
|
0.1 to 5 A dc, depending on
range (regulated)
For greatest accuracy do not leave on maximum
test current for more than 15 minutes
(50% duty cycle) (4 lower ranges) |
OPEN-CIRCUIT
VOLTAGE
|
approx. 25 V for
non-inductive resistance
approx. 45 V for transformer resistance |
RESISTANCE
RANGES
(Nominal)
|
Six ranges
Minimum measurable resistance 1µ
(least significant
digit on lowest range)Maximum measurable resistance 199.9
Full Scale
Test Current
1.999 m
5A
19.99 m
5A
199.9 m
5A
1.999
5A
19.99
1A
199.9
0.1A
|
ACCURACY
|
±0.3%of reading, or ±3
digits,
whichever is greater |
LENGTH OF TEST
LEADS
|
2 m (6 ft) (approx)
supplied, with Kelvin clips |
SIZE
|
44W x 31D x 18H cm (approx)
(23 cm high with lid closed
17W x 12D x 7H in. (approx)
(9 in. high with lid closed) |
WEIGHT
|
15 kg (33 lb) (approx) |
| |
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MODEL DOT-100
|
SPECIFICATIONS |
INPUT VOLTAGE
|
120 V, 60 Hz (approx 4 A) |
OUTPUT TEST
CURRENT
|
1 to 100 A dc
(70 A continous; 100 A at 50% duty cycle) |
OPEN-CIRCUIT
OUTPUT
|
Approx. 3 V or 6 V,
depending on range |
RESISTANCE
RANGES
(nominal)
|
Ten ranges (five ranges for
each of two current ranges)
Minimum measureable resistance 0.01µ
(least significant
digit on lowest range)Maximum measureable resistance 2
Full-scale values
on 10-A range:
0.2, 2, 20, 200, 2000 m
Full-scale values
on 100-A range:
0.02, 0.2, 2, 20, 200 m
|
ACCURACY
|
With the instrument fully
warmed up (3 minutes) and properly zeroed, the
resistance reading is correct to ±1%
±4 digits (±3% ±6 digits on 20-µ range) for currents in the
range 2-10 A and 20-100 A. If the ammeter reads
between 1 and 2A (10 and 20A on high range), the
resistance error may increase to ±4%.The ammeter will always
read the actual test current to an accuracy of
±1% ±1 digit.
Digital meters
used for both current and resistance
|
LEAD
RESISTANCE PERMITTED
(a) Current leads
(b) Potential leads
|
10m maximum will ensure proper operation
on all ranges at 100 A. Larger resistance is
acceptable a lower test currents.
100 maximum. |
LENGTH OF TEST
LEADS
|
2 m (6 ft) supplied
(lower resistance than specified above) |
SIZE
|
44W x 31D x 18H cm (23 cm
high with lid closed)
(17W x 12D x 7H in.) (9 in. high with lid closed) |
WEIGHT
|
23 kg (50 lb) |
| |
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