Ver. 3.2

10/06/23

*Note: A multimeter with filtered measurement mode is a filed US patent. To avoid the patent infringement, produce a DMM with

low pass filter mode is prohibited to export to USA. Keep pin55 floating could make the LPF mode disable.

1

ES51921

22,000 Counts Auto DMM

Features

• 22,000 counts LCD driver with 46-segment

bargraph display

• Conversion rate : 2 times/s

• Full automatic measurement

*Voltage measurement:

Manual 220.00mV / Auto 2.2000V – 1000.0V /

Auto 220.00 – 1000.0V

*Current measurement: μA/mA/A

*Resistance measurement:

220.00Ω – 220.00MΩ

*Capacitance measurement:

22.000nF – 220.00mF(25sec)

*Frequency counter

22.00Hz – 220.00MHz

• Current modes for clamp meter

• Duty cycle measurement (5.0% ~ 94.9%)

• Diode measurement

• Continuity check

• ADP mode with independent reference voltage

• Temperature mode with internal scale translation

• Push functions

*Range change function

*VAHZ function

*Relative function

*Zero function in manual DCA mode

*Data hold function with delay hold feature

*MAX/MIN function

*Back-light function

*KEY function

• Programmable LCD segment display

• Support low pass filter* for AC voltage & Clamp

ACA measurement

• SHIFT function

• High-crest-factor signal detection

• Band-gap reference voltage output

• CE selection (610V, 1010V or 1500V)

• Serial data output (RS232 format)

• LCD segment check when power on

• Auto power off with idle time selection

• Sleep output

• Re-power on

• On-chip buzzer driver

• 3V DC power supply

Description

ES51921 is an integrated analog-to-digital

converter (ADC) with 22,000 counts LCD

display, automatic range selection, and 3V DC

power supply. Automatic range selection is

provided for voltage (AC/DC) measurement,

resistance measurement, current measurement,

capacitance

measurement,

and

frequency

counter. Expensive and bulky mechanical

range switches are not required. Other features

include relative value display, Zero function,

data holding, maximum and minimum holding,

diode measurement, temperature measurement,

continuity checking, low battery detection,

auto power off, re-power on, and RS232 data

output.