Gossen Metrawatt Metrahit 14A

Gossen Metrawatt Metrahit 14A

Status	supported
Source code	gmx_mh_1x_2x
Counts	3100
IEC 61010-1	CAT III 1000 V, CAT IV 600 V
Connectivity	Infrared (RS232)
Measurements	voltage, current, resistance, temperature, diode, continuity
Features	autorange, data hold, bargraph

The Gossen Metrawatt Metrahit 14A is a 3100 counts handheld digital multimeter with IR (RS232) connectivity.

It is very similar to the Metrahit 14S, but has no ranges of 3 µA= and 3 mA≈.

Hardware

• Battery: 9 V IEC 6 F 22 or IEC 6 LR 61 or corresponding rechargeable battery
• Fuse:
  • Current 300 mA: FF 1,6 A/500G; 6,3x32 mm
  • Current 3A, 10A:
    • Siba Ultrarapid 16A/600 V≈ 10mm x 38 mm
    • Littlefuse KLK 15A/600 V≈ 13/32” / 1 1/2”
    • Bussmann KLK 15A/600 V≈ 13/32” / 1 1/2”

• TODO.

Photos

• 

  Front

• 

  Display

• 

  Back

• 

  Back/battery cover removed

• 

  Cover removed

Measurement functions and ranges

Measurement function	Range	Resolution	Accuracy	sigrok result	Remarks
V=	30.00 mV	10 μV	±(0,5% + 3)	mq V, unit V, mqflags DC	Manual range
	300.0 mV	100 μV		"	"
	3.000 V	1 mV	±(0,25% + 1)	"
	30.00 V	10 mV		"
	300.0 V	100 mV		"
	1000 V	1 V	±(0,35% + 1)	"
V≈	3.000 V	1 mV	±(0,75% + 2)	"
	30.00 V	10 mV		"
	300.0 V	100 mV		"
	1000 V	1 V		"
A=	3.000 mA	1 µA		mq Curr., unit A, mqflags DC	Disabled on power on, see below.
	30.00 mA	10 µA		"
	300.0 mA	100 µA		"
	3.000 A	1 mA		"	Disabled on power on, see below.
	10.00 A	10 mA		"
A≈	30.00 mA	10 µA		mq Curr., unit A, mqflags AC
	300.0 mA	100 µA		"
	10.00 A	10 mA		"
Ω	30.00 Ω	10 mΩ		mq Res., unit Ω, mqflags -	Allows setting zero: Press yellow button short, decimal dot blinks. Press yellow button long until device beeps twice or switch off to disable.
	300 Ω	100 mΩ		"
	3.000 kΩ	1 Ω		"
	30.00 kΩ	10 Ω		"
	300.0 kΩ	100 Ω		"
	3.000 MΩ	1 kΩ		"
	30.00 MΩ	10 kΩ		"
Diode/Cont.	3.000 V–	1 mV		mq V, unit V, mqflags DC,DIODE	Diode and cont. are identical on this device, just without beeper for diode.
°C	Pt100 –200.0 - +200.0 °C	0.1 °C	2 Kelvin + 5	mq Temp., unit °C, mqflags -
	Pt100 +200.0 - +850.0 °C		±(1.0% + 5)	"
	Pt1000 –100.0 - +200.0 °C		2 Kelvin + 2	"
	Pt1000 +200.0 - +850.0 °C		±(1.0% + 2)	"
Data Hold				mqflags += HOLD	Disabled while IR interface is active.
MIN				mqflags += MIN	Influences only display, via IR flag is set, but actual current value is delivered.
MAX				mqflags += MAX	Influences only display, via IR flag is set, but actual current value is delivered.

To enable the ranges 3.000 mA and 3.000 A, switch function selector to circle with dot symbol and press yellow button. Wait until auto calibration of these ranges is finished ("CAL" in display disappears). After that the ranges are available in the mA resp. A function until multimeter powered off automatically or manually.

The column "sigrok result" contains in short form what the driver generates for the resp. data type.