Digital calibrators Handycal 3850N (N = 0,1,2, Etc.)
The series 3850N Calibrators are low-cost, battery-operated, handheld single parameter precision instruments designed for sourcing as well as measuring mV, mA or ohm signals. They are derived from our field-proven series 853X calibrators for cost-effective calibration of a select subset of a variety process control instruments and systems.
A series 3850N instrument is designed with field-proven circuit blocks using low-power integrated circuits and operates on one 9V dry OR Ni-Cd cell. The battery voltage is monitored to provide low-battery indication. An exceptionally stable source provides continuously variable precision mV or mA or ohms output signals with two ten-turn potentiometers. A precision measuring circuit with an aged reference and a 3½ (4½) digit A/D converter provides a stable display with excellent repeatability. A self-check facility establishes correct functioning of all circuit blocks.
The Series 3850N instruments offer standard range options for user convenience and can be used in the laboratory or taken around the plant for in-situ calibration of instruments and loops. They are targeted to cover specific types of process control instruments and are suitable for mass calibration jobs in Manufacturing, Commissioning and Field Maintenance. Models with mA output can also be used as transmitter simulators (or current regulators) in 2-wire loops with loop power of upto 30V DC.
AVAILABLE MODELS
The Series offers the following models to suit calibration needs many applications
| Model |
I/O Code |
Functions & Ranges |
Resolution |
| 38500 |
A (3½) |
200/20mV |
1 in 2,000 |
| 38500 |
D (4½) |
2000/200mV |
1 in 20,000 |
| 38500 |
G (4½) |
Custom |
1 in 20,000 |
| 38501 |
A (3½) |
2000/200 Ω |
1 in 2,000 |
| 38501 |
D (4½) |
2000 Ω |
1 in 20,000 |
| 38501 |
G (4½) |
Custom |
1 in 20,000 |
| 38502 |
A (3½) |
200/20mA (22mA max) |
1 in 2,000 |
| 38502 |
D (4½) |
200/20mA (22mA max) |
1 in 20,000 |
| 38502 |
G (4½) |
Custom |
1 in 20,000 |
| 38503 |
A (3½) |
20mV/20mA |
1 in 2,000 |
| 38503 |
D (4½) |
200mV/20mA |
1 in 20,000 |
| 38503 |
G (4½) |
Custom |
1 in 20,000 |
| 38504 |
A (3½) |
20mV/200 Ω |
1 in 2,000 |
| 38504 |
D (4½) |
200mV/2000 Ω |
1 in 20,000 |
| 38504 |
G (4½) |
Custom |
1 in 20,000 |
OUTPUT SPECIFICATIONS
Output Impedance
| Voltage |
: |
< 0.05 ohm |
| Current |
: |
> 1 Megohm |
Source Capacity
| Voltage |
: |
Up to 250 mV minimum into 250 Ω |
| Current |
: |
Up to 20 mA minimum into 250Ω (800 Ω with loop power of 24V) |
| Ohms |
: |
Up to the maximum specified range |
INPUT SPECIFICATIONS
Input Impedance
| Voltage |
: |
> 1 Megohm |
| Current |
: |
1 or 10 ohm depending on range |
| Resistance |
: |
Bridge Current of 0.1/1 mA depending on range |
Input Protection
Input Terminals Protected for 24 V DC in Voltage & Ohms Ranges and up to double the range in mA Ranges
INDICATOR SPECIFICATIONS
Indicator Type
| 3½ digit |
: |
12 mm LCD with a resolution of 1 in 2,000 |
| 4½ digit |
: |
8 mm LCD with a resolution of 1 in 20,000 |
INSTRUMENT ACCURACY
Accuracy at operating temperature between 22-32 °C, valid with one year Calibration Cycle, will be
| 3½ digit |
: |
±0.05% of rdg ±0.05% of f.s. ±1 dgt |
| 4½ digit |
: |
±0.02% of rdg ±0.02% of f.s. ±2 dgts |
| Self-Check |
: |
Displays 1777±1 for 3½ and 17777±2 for 4½ dgt indicator |
POWER SUPPLY SPECIFICATIONS
The Models 38500, 38501 and 38504 can work with a dry cell with a reasonable life span for infrequent end uses. The life span will only be about 1~2 hours for Models 38502 and 38503 for current outputs from the instruments. However, they can be used with loop power with life spans of more than 4~5 hours. Option D is suitable for all Models.
Power Supply Options
| Option
C |
: |
1x9V Jerry Can Dry Cell ( Appropriate for Models 38500, 38501 & 38504) OK for 38502 & 38503 with Short Life |
| Option D |
: |
1x9V Ni-Cd Cells for Suitable for All |
Battery Life
| Dry Cells |
: |
5 ~ 6 Hrs in continuous use for 38500, 38501 & 38504
2 ~ 3 Hrs in continuous use at 12 mA for 38502 & 38503 |
| Ni-Cd Cells |
: |
4 ~ 5 Hrs in continuous use at 12mA output for 38502 & 38503 |
Low Battery
Indicated by lighting all decimals or "LO BAT" indicator
Mains Operation
A Jack is provided for operation on an external Battery Eliminator for all
ENVIRONMENTAL SPECIFICATIONS
| Rated Temp |
: |
5 to 55°C |
| Humidity |
: |
< 90% RH (Non-Condensing) |
| Zero Drift |
: |
< 1dgt for every 10°C beyond the specified ambient of 22 - 32 °C |
| Span Drift |
: |
< 0.0015% of rdg / °C |
| Storage Temp |
: |
0 to 70 °C (Without Batteries) |
MECHANICAL SPECIFICATIONS
| Enclosure Size |
: |
72(W) x 150(H) x 50(D) mm |
| Enclosure Finish |
: |
Powder Coated |
| Enclosure Weight |
: |
0.6 Kg (Without Batteries & Accessories) |
ACCESSORIES
Standard
Probe Set, Leather Case, Wooden Case, Instruction Manual, Warranty Certificate, Calibration Certificate Traceable to NPL
Battery Charger for Nicd-Cells in Power Supply Option B
Optional
24 V Regulated Power Supply for 38502 & 38503
ORDERING INFORMATION
While ordering please specify the various options as per the following ordering code
| Model No. |
I/O Option Code |
P.S. Option Code |
| 3850N |
X |
|
Example
Specify 38500AB to order the Calibrator with 3½ digit 12mm LCD display and a range of 200/20mV, operating on one 9V rechargeable cell. |
