HT Instruments HT410

HT Instruments HT410

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
Website	[1]

The HT Instruments HT410 is a 3100 counts handheld digital multimeter with IR (RS232) connectivity.

It is probably a low-cost OEM version of the Gossen Metrawatt Metrahit 15S, Rishabh 15S or a similar model with much worse specs, although the actual accuracy of Matthias' device seems to be better than the specs, according to the calibration certificate (!) that came with it. At least the test cords that come with it are Rishabh brand.

The IR connectivity is undocumented, possibly because no IR interface or software is available from the manufacturer. To enable sending data, press the DATA button while powering it on. See here for fitting interfaces.

Hardware

• Battery: 9 V NEDA1604, JIS006P, IEC6F22
• Fuse:
  • Current 300 mA: FF 1,6 A/1000V, 6,3x32 mm, 10 kA
  • Current 3A, 10A: FF 16 A/1000V, 10x38mm, 30 kA

• TODO.

Measurement functions and ranges

Measurement function	Range	Resolution	Accuracy	sigrok result	Remarks
V=	30.00 mV	10 μV	±(0,5% + 7)	mq V, unit V, mqflags DC	Manual range; Accuracy with ZERO, otherwise +35 digits.
	300.0 mV	100 μV		"	Manual range
	3.000 V	1 mV	±(0,25% + 5)	"
	30.00 V	10 mV		"
	300.0 V	100 mV		"
	1000 V	1 V	±(0,35% + 5)	"
V≈	3.000 V	1 mV	±(0,75% + 6)	"
	30.00 V	10 mV		"
	300.0 V	100 mV		"
	1000 V	1 V		"
A=	300 µA	0.1 µA	±(1.0% + 9)	mq Curr., unit A, mqflags DC
	3.000 mA	1 µA	±(1.0% + 6)	"
	30.00 mA	10 µA	±(1.0% + 9)	"
	300.0 mA	100 µA	±(1,0% + 6)	"
	3.000 A	1 mA	±(1,0% + 9)	"
	10.00 A	10 mA	±(1,0% + 6)	"
A≈	3.00 mA	1 µA	±(1,5% + 6)	mq Curr., unit A, mqflags AC
	300.0 mA	100 µA		"
	10.00 A	10 mA		"
Ω	30.00 Ω	10 mΩ	±(0.5% + 7)	mq Res., unit Ω, mqflags -	Accuracy with ZERO, otherwise +30 digits.
	300.0 Ω	100 mΩ		"
	3.000 kΩ	1 Ω	±(0.4% + 5)	"
	30.00 kΩ	10 Ω		"
	300.0 kΩ	100 Ω		"
	3.000 MΩ	1 kΩ	±(0.6% + 5)	"
	30.00 MΩ	10 kΩ	±(2.0% + 5)	"
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. Cont. beeps < 120 Ω.
Cap. F	30.00 nF	10 pF	±(1.0% + 7)	mq Cap., unit F, mqflags -	Accuracy with ZERO, otherwise +50 digits.
	300.0 nF	100 pF		"
	3.000 µF	1 nF		"
	30.00 µF	10 nF	±(3.0% + 7)	"
Hz≃	300.0 Hz	0.1 Hz	±(0.5% + 5)	mq Freq., unit Hz, mqflags AC,DC
	3.000 kHz	1 Hz		"
	30.00 kHz	10 Hz		"
	100.00 kHz	100 Hz		"
Duty cycle	2% - 98%	0.1 %	±5	mq Temp., unit °C, mqflags -
°C	Pt100 –200.0 - +200.0 °C	0.1 °C	±(2 K + 9)	mq Temp., unit °C, mqflags -
	Pt100 +200.0 - +850.0 °C		±(1.0% + 9)	"
	Pt1000 –100.0 - +200.0 °C		±(2 K + 6)	"
	Pt1000 +200.0 - +850.0 °C		±(1.0% + 6)	"
Data Hold				mqflags += HOLD	Disabled while IR interface is active.
MIN				mqflags += MIN	Disabled while IR interface is active.
MAX				mqflags += MAX	Disabled while IR interface is active.

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

The accuracy specification is incomplete, see manual for exact specs.