Gossen Metrawatt T-Com KMM2002

Gossen Metrawatt T-Com KMM2002

Status	in progress
Source code	gmc_mh_1x_2x
Counts	3100 (31000)
IEC 61010-1	CAT II 1000 V
Connectivity	Infrared (RS232)
Measurements	voltage, current, resistance, capacitance, temperature, diode, continuity
Features	autorange, data hold, bargraph, backlight
Website	[1]

The Gossen Metrawatt T-Com KMM2002 is a 3100 counts handheld digital multimeter with IR (RS232) connectivity and insulation measurement (100 V). It seems to be an OEM version of the Metrahit 16T especially made for T-Com (Deutsche Telekom). Additional features seems to be a backlight and a 30 nF capacity range.

The resolution is one digit higher on the data interface.

Hardware

• Battery: 9 V IEC 6 LR 61
• Fuse: None! (not required, no internal amps ranges)

• TODO.

Measurement functions and ranges

The specifications of the KMM2002 seem not to be available to the public. The following is taken from the specs of the Metrahit 16T which seems to be almost identical and the Metrahit 16I .

Measurement function	Range	Resolution	Deviation	sigrok result	Remarks
V=	30 mV	10 μV	±(0,5% + 3)	mq V, unit V, mqflags DC	Input impendance >10 GΩ; not covered by autorange, use manual range
	300 mV	100 μV	±(0,5% + 3)	"	"
	3 V	1 mV	±(0,25% + 1)	"
	30 V	10 mV		"
	300 V	100 mV		"
	1000 V	1 V	±(0,35% + 1)	"
V≈	3 V	100 μV	±(1.0% + 3) (> 10 Digit)	mq V, unit V, mqflags AC,RMS
	30 V	100 μV		"
	300 V	1 mV		"
	1000 V	10 mV		"
V≃	3 V	100 μV	±(1.0% + 3) (> 10 Digit)	mq V, unit V, mqflags AC,DC,RMS
	30 V	100 μV		"
	300 V	1 mV		"
	1000 V	10 mV		"
A≈ (clamp only)	30 A	10 mA	±(2,5% + 3) (>10 Digit)	mq Curr., unit A, mqflags AC,DC,RMS	Current clamp with 100 mV/A required, e.g. GMC WZ12B
	100 A	100 mA		"
Ω	30.00 Ω	10 mΩ	±(0,5% + 3)	mq Res., unit Ω, mqflags -
	300.0 Ω	100 mΩ		"
	3.000 kΩ	1 Ω	±(0,4% + 1)	"
	30.00 kΩ	10 Ω		"
	300.0 kΩ	100 Ω		"
	3.000 MΩ	1 kΩ	±(0,6% + 1)	"
	30.00 MΩ	10 kΩ	±(2,0% + 1)	"
Ω Iso 100V	310 MΩ	100 Ω - 100 kΩ	±(3% + 2)	mq Res., unit Ω, mqflags -	Altogether 4 ranges with different resolution
Diode/Cont.	3.0000 V–	1 mV	±(0,25% + 1)	mq V, unit V, mqflags DC,DIODE	Diode and cont. are identical on this device, just without beeper for diode.
Cap. F	30.00 nF	10 pF	±(1,0% + 3)	mq Cap., unit F, mqflags -
	300.0 nF	100 pF		"
	3.000 µF	1 nF		"
Hz=	300.0 Hz	0.01 Hz	±(0.1% + 3)	mq Freq., unit Hz	The protocol does not allow to differ AC and DC.
	3.000 kHz	0.1 Hz		"
	30.00 kHz	1 Hz		"
	100.00 kHz	10 Hz		"
Hz≈	300.0 Hz	0.01 Hz	±(0.1% + 3)	mq Freq., unit Hz	The protocol does not allow to differ AC and DC.
	3.000 kHz	0.1 Hz		"
	30.00 kHz	1 Hz		"
	100.00 kHz	10 Hz		"
°C	Pt100 –200.0 - +200.0 °C	0.1 °C	2 Kelvin + 5	mq Temp., unit °C, mqflags -	°F temperature ranges accordingly, but not available via serial interface.
	Pt100 +200.0 - +800.0 °C		±(1.0% + 5)	"
	Pt1000 –100.0 - +200.0 °C		2 Kelvin + 5	"
	Pt1000 +200.0 - +800.0 °C		±(1.0% + 5)	"
Event count					Seems not to be present on data output.
Data Hold				mqflags += HOLD	Disabled while IR interface is active on  Matthias' device.
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.

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